RE: TCP speed

["Greg Joyce" <greg@gilhooley.com>]

> -----Original Message-----
> From: YP Cheng
...
>
> I do believe TCP is a wrong protocol for iSCSI.  A SCSI request from an
> initiator is inherently acknowledged by its response from a target.
> Therefore, UDP for iSCSI is a better choice.  NFS is implemented on UDP.

You're not considering the other thing that TCP gives you:

- congestion control
- retransmission
- sequencing
- ...

Once you build that on top of UDP, you'll have something very TCP-like
without the benefit of years of tuning and refinement. I think you'd also
find that the performance was comparable.

In fact NFS is implemented on TCP as well and I believe that WAN performance
is probably better over TCP than UDP. LAN performance should be similar.

Greg
--
Greg Joyce 			greg@ipperformance.com
VP Product Development
IP Performance		512-448-1879